Re: [Exim] exim HELO ack

Hi Wakko!

> Unfortunately, people behind firewalls can't use $interface_address.

In that case, maybe you can check for the sending host's address and
reject HELOs that give an IP address which doesn't match:

deny    condition     = ${if match{$sender_helo_name}{\N^\d+(\.\d+){3}$\N}\
                          {yes}{no}}
        condition     = ${if eq{$sender_helo_name}{$sender_host_address}\
                          {no}{yes}}
        message       = Invalid recipient
        log_message   = open proxy (HELO)

Andy